Publication date: 08/13/2020

Specify Two Y Columns

You can specify two Y columns when some of the degradation measurements are interval censored or left censored. For a given row, values in the two Y columns are handled as follows:

If the two Y values are equal and neither is missing, then the common measurement is treated as exact.

If the two Y values are not equal and neither is missing, then the measurement is interval censored and assumed to be between the two values.

If only the first value is missing, then the measurement is left censored and assumed to be smaller than the second value.

If only the second value is missing, then the measurement is right censored and assumed to be larger than the first value.

Note: The only way to fit left-censored measurements in the Destructive Degradation platform is through the use of two Y columns.

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